Seiko Cal. 5640 - 931

This Spring Drive model from 1966 features a 45mm Gold-Plated case. The Fixed bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-f6b143eccbae]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Burgundy

Jewels

17j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1966

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